@bigstew,
" combined effect´" imply s a non linear extrinsic relational bound in between causes in the emergence of pain which generate an association in an effect, in the case pain is an informative value, not painful in itself, dependent on contrast and background...it presupposes a subject receptor which must itself not be pain in order to be informed of a pain value which then together
generates "working" pain...pain is not for itself or in itself !!!
...let me just ad if you don´t have anything else to properly counter, then cheap peaking on my informal yet accurate presentation is rather pointless, I suggest you move on...everybody else in so far probably understood better what I said then the reasons you claim to have for intrinsic value in pain, which to me is just a true labyrinth of confusion...
(appreciate your input on emphasising, a gross mistake while correcting the writing due to quickly reading the dictionary options ending up making the wrong underlined choice)